Clean Water Act discharge permit · NPDES CA0083771
NORTHWEST WWTF, Rio Vista, CA: NPDES CA0083771 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 190Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
NORTHWEST WWTF, held by Rio Vista, City of, holds NPDES permit CA0083771, which discharges to Sacramento River. EPA’s file records it issued February 18, 2021 and expiring March 31, 2026. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | NORTHWEST WWTF |
|---|---|
| Permittee as filed | Rio Vista, City of |
| NPDES ID | CA0083771 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | February 18, 2021 |
| Expiration date | March 31, 2026 |
| Address | Rio Vista, CA 94571 |
| Receiving water | Sacramento River |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Threemile Slough-Sacramento River (HUC 180201630703) |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 190Pollutants on file
- 190Under a numeric limit
- 178With a violation of any kind
- 8With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant; the 60 with the most exceedances of 190 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Temperature, water deg. fahrenheit | 2 | 27 | 17 | April 30, 2024 | 316% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 11 | 4 | September 30, 2020 | 276% over the limit |
| Coliform, total general | 2 | 20 | 3 | January 31, 2021 | 3,378% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 17 | 3 | November 30, 2022 | 136% over the limit |
| Specific conductance | 4 | 3 | 3 | December 31, 2019 | 5% over the limit |
| Solids, total suspended | 6 | 11 | 2 | July 31, 2019 | 51% over the limit |
| pH | 6 | 6 | 1 | October 31, 2024 | |
| Mercury, total recoverable | 3 | 1 | 1 | December 31, 2024 | 10% over the limit |
| Carbon, dissolved organic [as C] | 1 | 3 | 0 | ||
| Cyanide, total [as CN] | 1 | 3 | 0 | ||
| Sulfide, total [as S] | 1 | 3 | 0 | ||
| Asbestos | 1 | 3 | 0 | ||
| Beryllium, total recoverable [as Be] | 1 | 3 | 0 | ||
| Cadmium, total recoverable | 1 | 3 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 1 | 3 | 0 | ||
| Tributyltin | 1 | 3 | 0 | ||
| Methyl tert-butyl ether [MTBE] | 1 | 3 | 0 | ||
| Dinoseb | 1 | 3 | 0 | ||
| Dichlorobromomethane | 1 | 3 | 0 | ||
| Carbon tetrachloride | 1 | 3 | 0 | ||
| 1,2-Dichloroethane | 1 | 3 | 0 | ||
| Bromoform | 1 | 3 | 0 | ||
| Dibromochloromethane | 1 | 3 | 0 | ||
| Toluene | 1 | 3 | 0 | ||
| Benzene | 1 | 3 | 0 | ||
| .delta.-BHC | 1 | 3 | 0 | ||
| Acenaphthylene | 1 | 3 | 0 | ||
| Acenaphthene | 1 | 3 | 0 | ||
| Acrolein | 1 | 3 | 0 | ||
| Acrylonitrile | 1 | 3 | 0 | ||
| Anthracene | 1 | 3 | 0 | ||
| Benzo[b]fluoranthene | 1 | 3 | 0 | ||
| Benzo[k]fluoranthene | 1 | 3 | 0 | ||
| Benzo[a]pyrene | 1 | 3 | 0 | ||
| Bis[2-chloroethyl] ether | 1 | 3 | 0 | ||
| Bis[2-chloroethoxy]methane | 1 | 3 | 0 | ||
| Bis[2-chloroisopropyl] ether | 1 | 3 | 0 | ||
| Butyl benzyl phthalate | 1 | 3 | 0 | ||
| Chlorobenzene | 1 | 3 | 0 | ||
| Chrysene | 1 | 3 | 0 | ||
| Diethyl phthalate | 1 | 3 | 0 | ||
| Dimethyl phthalate | 1 | 3 | 0 | ||
| 1,2-Diphenylhydrazine | 1 | 3 | 0 | ||
| Endosulfan sulfate | 1 | 3 | 0 | ||
| .beta.-Endosulfan | 1 | 3 | 0 | ||
| .alpha.-Endosulfan | 1 | 3 | 0 | ||
| Endrin aldehyde | 1 | 3 | 0 | ||
| Ethylbenzene | 1 | 3 | 0 | ||
| Fluoranthene | 1 | 3 | 0 | ||
| Fluorene | 1 | 3 | 0 | ||
| Hexachlorocyclopentadiene | 1 | 3 | 0 | ||
| Hexachlorobutadiene | 1 | 3 | 0 | ||
| Hexachloroethane | 1 | 3 | 0 | ||
| Indeno[1,2,3-cd]pyrene | 1 | 3 | 0 | ||
| Isophorone | 1 | 3 | 0 | ||
| Methyl bromide [Bromomethane] | 1 | 3 | 0 | ||
| Methyl chloride [Chloromethane] | 1 | 3 | 0 | ||
| Methylene chloride | 1 | 3 | 0 | ||
| N-Nitrosodi-N-propylamine | 1 | 3 | 0 | ||
| N-Nitrosodiphenylamine | 1 | 3 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES CA0083771.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.